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Related Concept Videos

Phase Diagrams02:39

Phase Diagrams

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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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Phase Transitions02:31

Phase Transitions

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Inductance: Single-Phase And Three-Phase Line01:28

Inductance: Single-Phase And Three-Phase Line

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Understanding the inductance of transmission lines is crucial for efficient design and operation in electrical power systems. This discussion delves into the inductance characteristics of single-phase two-wire and three-phase three-wire transmission lines with equal phase spacing.
Single-Phase Two-Wire Line:
A single-phase line consists of two solid cylindrical conductors, denoted as x and y. Each conductor carries phasor currents ix and iy, respectively. Given that the sum of these currents is...
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Capacitance: Single-Phase And Three-Phase Line01:25

Capacitance: Single-Phase And Three-Phase Line

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In electrical power systems, understanding the capacitance of transmission lines is fundamental for efficient operation.
Single-Phase Lines
Consider a single-phase, two-wire transmission line with equal phase spacing energized by a voltage source. One conductor carries a uniform positive charge, while the other carries an equal negative charge. The capacitance C of the line can be derived from the voltage V between the conductors. For a one-meter section of the line, the capacitance is given...
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Phase Changes01:19

Phase Changes

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Phase transitions play an important theoretical and practical role in the study of heat flow. In melting or fusion, a solid turns into a liquid; the opposite process is freezing. In evaporation, a liquid turns into a gas; the opposite process is condensation.
A substance melts or freezes at a temperature called its melting point and boils or condenses at its boiling point. These temperatures depend on pressure. High pressure favors the denser form of the substance, so typically, high pressure...
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Phase separation strategy to facilely form fluorescent [Ag

Xiaotong Chen1, Junjie Zhao, Xiuxia Xu

  • 1State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China. qiaoxus@zju.edu.cn.

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Summary

Researchers developed novel multiphase glasses containing silver species for tunable luminescence. Adjusting glass composition controls silver aggregation, enabling ultraviolet, green-white, and orange light emission for potential white light applications.

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Luminescence

Background:

  • Multiphase glasses offer tunable optical properties through controlled phase separation.
  • Silver species (ions, pairs, quantum clusters) exhibit distinct luminescence characteristics.
  • Controlling silver aggregation is key to achieving desired emission colors.

Purpose of the Study:

  • To design and prepare novel SiO2-Al2O3-B2O3-Na2O-ZnO/ZnF2-SrO/SrF2-Ag multiphase glasses.
  • To investigate the role of phase separation in stabilizing different silver species.
  • To achieve tunable luminescence and white light emission.

Main Methods:

  • Melt-quenching method for glass preparation.
  • Phase separation strategy to create distinct sub-phases (B2O3-rich, ZnO-Al2O3-rich).
  • Spectroscopic analysis to identify silver species and luminescence centers.

Main Results:

  • Successfully synthesized multiphase glasses with controlled ZnF2-SrF2/ZnO-SrO content.
  • Identified three distinct silver luminescence centers: Ag+ (UV), [Ag2]2+ (green-white), and [Agm]n+ QCs (orange).
  • Achieved a high quantum yield of 55.7% for [Agm]n+ QCs and demonstrated white light emission.

Conclusions:

  • Phase separation is crucial for stabilizing different silver species in glass matrices.
  • Glass composition directly influences silver aggregation and luminescence properties.
  • These novel glasses show potential for applications requiring tunable and white light emission.